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US5445133A
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US
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Canister purge gas control device and control method for internal combustion engine
Assignee: Hitachi Ltd
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Filing: 1994-11-23
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Granted: 1995-08-29
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Expires: 2014-11-23
Abstract
Abstract A fuel injection control device for an internal combustion engine includes a canister which temporarily collects fuel vapor purge gas generated in a fuel tank and a canister purge gas control system which introduces the collected fuel vapor purge gas into the internal combustion engine during the operation thereof. The canister purge gas control system includes a purge gas air/fuel ratio calculating system which determines the purge gas air/fuel ratio of the collected fuel vapor purge gas to be introduced into the combustion engine, and only during a time when the purge gas air/fuel ratio calculated by the purge gas air/fuel ratio calculating system is within a predetermined range, the canister purge gas control system interrupts the introduction of the collected fuel vapor purge gas into the internal combustion engine so as to permit an air/fuel ratio learning control system to perform an air/fuel ratio learning control, whereby an air/fuel ratio learning control is performed without causing an air/fuel ratio variation and an output power variation of the internal combustion engine.
Inventors
- 👤 Mamoru Nemoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:22
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/0025; F02D41/003; F02D41/0045; F02D41/24; F02D41/2406; F02D41/2425; F02D41/2429; F02D41/2441; F02D41/2451; F02D41/2454; F02M; F02M25/00; F02M25/08; F02D41/0042; F02D41/2448
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
208 words
A fuel injection control device for an internal combustion engine, comprising: a canister which temporarily collects fuel vapor purge gas generated in a fuel tank; a canister purge gas control means which introduces the collected fuel vapor purge gas into the internal combustion engine during the operation thereof; an air/fuel ratio feed back control means which controls an air/fuel ratio of air and fuel mixture introduced into the internal combustion engine by making use of an air/fuel ratio sensor; and an air/fuel ratio learning function control means which performs a learning so that an air/fuel ratio correction from said air/fuel ratio feed back control means settles at a predetermined value, wherein said canister purge gas control means includes a purge gas air/fuel ratio calculating means which determines the purge gas air/fuel ratio of the collected fuel vapor purge gas to be introduced into the combustion engine and, only during a time when the purge gas air/fuel ratio calculated by said purge gas air/fuel ratio calculating means is within a predetermined range, said canister purge gas control means interrupts the introduction of the collected fuel vapor purge gas into the internal combustion engine and said air/fuel ratio learning control means is started to perform the air/fuel ratio learning control.
Claim 2
Dependent Claim
208 words
A fuel injection control device for an internal combustion engine, comprising: a canister which temporarily collects fuel vapor purge gas generated in a fuel tank; a canister purge gas control means which introduces the collected fuel vapor purge gas into the internal combustion engine during the operation thereof; an air/fuel ratio feed back control means which controls an air/fuel ratio of air and fuel mixture introduced into the internal combustion engine by making use of an air/fuel ratio sensor; and an air/fuel ratio learning function control means which performs a learning so that an air/fuel ratio correction from said air/fuel ratio feed back control means settles at a predetermined value, wherein said canister purge gas control means includes a purge gas air/fuel ratio calculating means which determines the purge gas air/fuel ratio of the collected fuel vapor purge gas to be introduced into the combustion engine and, only during a time when the purge gas air/fuel ratio calculated by said purge gas air/fuel ratio calculating means is within a predetermined range, said canister purge gas control means interrupts the introduction of the collected fuel vapor purge gas into the internal combustion engine and said air/fuel ratio learning control means is started to perform the air/fuel ratio learning control.
Claim 3
Dependent Claim
29 words
A fuel injection control device for an internal combustion engine according to claim 1, wherein the predetermined range of the purge gas air/fuel ratio is between 14.0 and 16.0.
Claim 4
Dependent Claim
59 words
A fuel injection control device for an internal combustion engine according to claim 1, wherein when a variation of a purge gas containing rate in the air and fuel mixture introduced into the internal combustion engine exceeds a predetermined value, the calculation of the purge gas air/fuel ratio performed by said purge gas air/fuel ratio calculating means is interrupted.
Claim 5
Dependent Claim
174 words
A fuel injection control method for an internal combustion engine, comprising the steps of: collecting temporarily fuel vapor purge gas generated in a fuel tank into a canister; controlling introduction of the collected fuel vapor purge gas into the internal combustion engine during the operation thereof; feed back controlling of the air/fuel ratio of air and fuel mixture introduced into the internal combustion engine by making use of an air/fuel ratio sensor; performing air/fuel ratio learning control so that an air/fuel ratio correction performed by said feed back controlling step settles at a predetermined value; calculating a purge gas air/fuel ratio of the collected fuel vapor purge gas to be introduced into the internal combustion engine; interrupting the introduction of the collected fuel vapor purge gas into said internal combustion engine only during a time when the purge gas air/fuel ratio determined in said purge gas air/fuel ratio calculating step is within a predetermined range; and thereafter performing air/fuel ratio learning control of the air and fuel mixture introduced into the internal combustion engine.
Claim 6
Dependent Claim
174 words
A fuel injection control method for an internal combustion engine, comprising the steps of: collecting temporarily fuel vapor purge gas generated in a fuel tank into a canister; controlling introduction of the collected fuel vapor purge gas into the internal combustion engine during the operation thereof; feed back controlling of the air/fuel ratio of air and fuel mixture introduced into the internal combustion engine by making use of an air/fuel ratio sensor; performing air/fuel ratio learning control so that an air/fuel ratio correction performed by said feed back controlling step settles at a predetermined value; calculating a purge gas air/fuel ratio of the collected fuel vapor purge gas to be introduced into the internal combustion engine; interrupting the introduction of the collected fuel vapor purge gas into said internal combustion engine only during a time when the purge gas air/fuel ratio determined in said purge gas air/fuel ratio calculating step is within a predetermined range; and thereafter performing air/fuel ratio learning control of the air and fuel mixture introduced into the internal combustion engine.
Claim 7
Dependent Claim
51 words
A fuel injection control method for an internal combustion engine according to claim 4, further comprising the step of: interrupting said purge gas air/fuel ratio calculating step when variation of a purge gas containing rate in the air and fuel mixture introduced into the internal combustion engine exceeds a predetermined value.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-08-28 | 1999-02-27 | 1999-08-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-08-28 | 2003-02-27 | 2003-08-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-08-28 | 2007-02-27 | 2007-08-29 | $7700.00 | Window Closed / Lapsed |